adaptive-expressions
Version:
Common Expression Language
65 lines • 2.52 kB
JavaScript
;
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Add = void 0;
const expressionEvaluator_1 = require("../expressionEvaluator");
const expressionType_1 = require("../expressionType");
const functionUtils_1 = require("../functionUtils");
const returnType_1 = require("../returnType");
/**
* Return the result from adding two or more numbers (pure number case) or concatting two or more strings (other case).
*/
class Add extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [Add](xref:adaptive-expressions.Add) class.
*/
constructor() {
super(expressionType_1.ExpressionType.Add, Add.evaluator(), returnType_1.ReturnType.String | returnType_1.ReturnType.Number, Add.validator);
}
/**
* @private
*/
static evaluator() {
return functionUtils_1.FunctionUtils.applySequenceWithError((args) => {
let value;
let error;
const stringConcat = !functionUtils_1.FunctionUtils.isNumber(args[0]) || !functionUtils_1.FunctionUtils.isNumber(args[1]);
if ((args[0] == null && functionUtils_1.FunctionUtils.isNumber(args[1])) ||
(args[1] == null && functionUtils_1.FunctionUtils.isNumber(args[0]))) {
error = "Operator '+' or add cannot be applied to operands of type 'number' and null object.";
}
else if (stringConcat) {
if (args[0] == null && args[1] == null) {
value = '';
}
else if (args[0] == null) {
value = args[1].toString();
}
else if (args[1] == null) {
value = args[0].toString();
}
else {
value = args[0].toString() + args[1].toString();
}
}
else {
value = args[0] + args[1];
}
return { value, error };
}, functionUtils_1.FunctionUtils.verifyNumberOrStringOrNull);
}
/**
* @private
*/
static validator(expression) {
functionUtils_1.FunctionUtils.validateArityAndAnyType(expression, 2, Number.MAX_SAFE_INTEGER, returnType_1.ReturnType.String | returnType_1.ReturnType.Number);
}
}
exports.Add = Add;
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